Look! There is eraser on the desk.A. a B. an C. the D. /

问题补充：

Look! There is eraser on the desk.

A. a

B. an

C. the

D. /

答案：

A. a

(答案→)B. an

C. the

D. /

解析：句意:看,桌子上有一块橡皮.结合语境可知本句中泛指任何一块橡皮.故用不定冠词.eraser词首音素是元音,故不定冠词用an,选B.